Answer
$600$ three-digit numbers are possible.
Work Step by Step
First digit: 6 choices: $4,5,6,7,8,9$
Second digit: 10 choices
Third digit: 10 choices
Using the Fundamental Counting Principle:
$6\times10\times10=600$
Algebra and Trigonometry 10th Edition
by Larson, Ron
Published by
Cengage Learning
ISBN 10:
9781337271172
ISBN 13:
978-1-33727-117-2
Chapter 11 - 11.6 - Counting Principles - 11.6 Exercises - Page 823: 23d
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